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Income Taxes - Significant Components of Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets:      
Carry-forward losses and credits $ 25,834 $ 50,673  
Inventory and warranty reserves 17,734 24,253  
Accrued expenses and other reserves 15,393 16,176  
Stock-based compensation 5,092 8,995  
Executive supplemental retirement benefits 4,984 6,888  
Other 597    
Total deferred tax assets 69,634 106,985  
Deferred tax liabilities:      
Acquired intangible assets (83,092) (127,571)  
Depreciation and amortization (10,150) (16,428)  
Loan costs (2,157) (7,282)  
Foreign withholding taxes (16,206)    
Unrealized gain (469) (3,195)  
Other   (1,336)  
Total deferred tax liabilities (112,074) (155,812)  
Valuation allowance (13,629) (12,527) $ (6,127)
Net deferred tax (liabilities) assets $ (56,069) $ (61,354)